# US 12,763,231 B2 · Insulated electric wire and manufacturing method of insulated electric wire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,763,231 B2 - Document ID: US12763231B2 - Status: Granted - Kind: B2 - Application number: 18/609,386 - Filed: 2024-03-19 - Published: 2024-09-26 - Granted: 2026-10-13 - Earliest claimed: 2023-03-22 - Assignees: Proterial, Ltd. - Applicants: Proterial, Ltd. - Inventors: Hideyuki Suzuki; Naoto Teraki; Masamichi Kishi; Seiichi Kashimura; Kazufumi Suenaga; Kanako Suganuma - Web page: https://patentgrep.com/patent/US12763231B2 ## CPC - H01B 3/02: mainly consisting of inorganic substances - C10M 119/22: containing halogen - C10M 2213/0606: used as base material - C10M 2213/0623: used as base material - C10N 2040/32: Wires, ropes or cables lubricants - C10N 2050/023: {Multi-layer lubricant coatings} - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33) - C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS ## Abstract An insulated electric wire is provided with a metal conductor, and an insulation coating layer covering an outer periphery of the metal conductor. The insulation coating layer includes a lubricant layer including fluorine-based fine particles as a lubricant as an outermost layer, and an enamel insulation layer including fluorine-based fine particles as an inner layer with respect to the lubricant layer. ## Claims ### Claim 1 An insulated electric wire, comprising: a metal conductor; and an insulation coating layer covering an outer periphery of the metal conductor, wherein the insulation coating layer comprises a lubricant layer including fluorine-based fine particles as a lubricant as an outermost layer, and a single enamel insulation layer including fluorine-based fine particles as an inner layer with respect to the lubricant layer such that every layer of the insulation coating layer includes fluorine-based fine particles. ### Claim 2 (depends on 1) The insulated electric wire, according to claim 1, wherein the fluorine-based fine particles of the lubricant layer and the fluorine-based fine particles of the enamel insulation layer are of a same kind. ### Claim 3 (depends on 2) The insulated electric wire, according to claim 2, wherein the fluorine-based fine particles of the lubricant layer and the fluorine-based fine particles of the enamel insulation layer are fine particles of polytetrafluoroethylene or fine particles of perfluoroalkoxyalkane. ### Claim 4 (depends on 3) The insulated electric wire, according to claim 3, wherein a percentage of the fluorine-based fine particles in the enamel insulation layer is 0.5 wt % or more and 60.0 wt % or less. ### Claim 5 (depends on 2) The insulated electric wire, according to claim 2, wherein the lubricant layer is formed directly on the enamel insulation layer, and the lubricant layer is formed by the fluorine-based fine particles combined with the fluorine-based fine particles that are exposed on the outer surface of the enamel insulation layer. ### Claim 6 (depends on 1) The insulated electric wire, according to claim 1, wherein an outer diameter of the metal conductor is 10 μm or more and 50 μm or less, a thickness of the insulation coating layer is 3 μm or more and 10 μm or less, a thickness of the lubricant layer is 1 μm or more and 8 μm or less, and a thickness of the enamel insulation layer is 1 μm or more and 8 μm or less. ### Claim 7 (depends on 1) The insulated electric wire, according to claim 1, further comprising: an insulative wire in a thread-like form, wherein an outer periphery of the insulative wire is coated with the metal conductor. ### Claim 8 (depends on 1) The insulated electric wire, according to claim 1, wherein the metal conductor is composed of an alloy including at least one of copper, silver, and aluminum, or composed of a single metal. ### Claim 9 (depends on 1) The insulated electric wire, according to claim 1, wherein the metal conductor composed of an alloy including at least one of copper, silver, and aluminum, or composed of a single metal is plated on a surface. ### Claim 10 (depends on 1) A manufacturing method of the insulated electric wire according to claim 1, comprising: forming the lubricant layer by adhering a dispersion liquid, including the fluorine-based fine particles dispersed into a liquid dispersion medium, onto an outer periphery of the enamel insulation layer, and drying and baking the dispersion liquid. ### Claim 11 (depends on 10) The manufacturing method according to claim 10, wherein the baking temperature of the lubricant layer is higher than that for the enamel insulation layer. ### Claim 12 (depends on 1) The insulated electric wire, according to claim 1, wherein the fluorine-based fine particles in the enamel insulation layer bind with the fluorine-based fine particles in the lubricant layer such that the enamel insulation layer functions as a primer for the lubricant layer. ### Claim 13 (depends on 12) The insulated electric wire, according to claim 12, wherein the lubricant layer is formed directly on the enamel insulation layer, and the lubricant layer is formed by the fluorine-based fine particles combined with the fluorine-based fine particles that are exposed on the outer surface of the enamel insulation layer. ### Claim 14 (depends on 1) The insulated electric wire, according to claim 1, wherein the fluorine content in the enamel insulation layer 31 is 1.0 wt. % or more and 20 wt. % or less. ### Claim 15 (depends on 1) The insulated electric wire, according to claim 1, wherein some fluorine-based fine particles are exposed on an outer surface of the enamel insulation layer and are partially buried inside the enamel insulation layer. ### Claim 16 (depends on 1) The insulated electric wire, according to claim 1, wherein the single enamel insulation layer directly contacts the metal conductor on an inner side surface and directly contacts the insulation coating layer on an outer side surface. ### Claim 17 An insulated electric wire, comprising: a metal conductor; and an insulation coating layer covering an outer periphery of the metal conductor, wherein the insulation coating layer comprises a lubricant layer including fluorine-based fine particles as a lubricant as an outermost layer, and an enamel insulation layer including fluorine-based fine particles as an inner layer with respect to the lubricant layer, wherein the fluorine-based fine particles of the enamel insulation layer are the fine particles of polytetrafluoroethylene, and the lubricant layer includes the fine particles of perfluoroalkoxyalkane in addition to the fine particles of polytetrafluoroethylene as the fluorine-based fine particles, and wherein a percentage of the fine particles of perfluoroalkoxyalkane in the lubricant layer is 0.5 wt % or more and 5.0 wt % or less. ### Claim 18 An insulated electric wire, comprising: a metal conductor; and a single insulation coating layer covering an outer periphery of the metal conductor, wherein the insulation coating layer comprises a lubricant layer including fluorine-based fine particles as a lubricant as an outermost layer, and an enamel insulation layer including fluorine-based fine particles as an inner layer with respect to the lubricant layer wherein the average particle size of the fluorine-based fine particles is 1.0 μm or less. ### Claim 19 (depends on 18) The insulated electric wire, according to claim 18, wherein the average particle size of the fluorine-based fine particles is 0.2 μm or more and 0.5 μm or less.